I really like the rogues T1 set. To me it looks very "rogue like" with it being slim not too flashy. The helm looks quite nice as well.
Tier 2. The sets from tier two are iconic, yes they stats were god awful and the drop rates were not always what i wanted but on my warrior tier 2 was amazing. I think that the new 4.2 tiers are good looking but im not real happy with the new crazy stats, I remember have 20k hp unbuffed was an impressive thing but now, 20k is nothing,-Bryan
The Warriors S8 Set (Wrathful). Looks so badass and have that im-going-to-chop-your-head-off look
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Loved Shaman tier 10, the 10h/25n version. So frosty with all the icicles. And who didn't love the shoveltusk animation? :D
I'd have to say my favorite is the paladin tier 2 set.
love the t11 druid shoulder with these crystal shoulders very nice! Stormrider's Mantle
Many of the T7/7.5 items don't hold a candle to the original versions of the armor introduced all the way back in vanilla, and the Druid tier 3 set is no exception to this rule. The coloring feels much more aesthetically pleasing on the tier 3 than the recolors put into wrath. I really wish I could go back in time and get the set.And although these items don't count as a set (due to lack of bonuses), I think that the Druid tier 1 outland recolor set is worth mentioning. Then again, there are several recolors in Outland roics that are underrated.See: Red Paladin Tier 1, Green Warrior Tier 2, Blue rogue tier 2, Orange warlock Tier 2
I liked the tier 4 warlock set I cant help it I just loved the glowing eyes
I have never really done much raiding. But the set that caught my eye the most was the Warlock Tier 8 set. I loved the over all look of the set. It made me feel like i could make my Blood Elf actually look like a bad ass.
I like warrior S2 and T5 on Undead best. Add the engineer-glasses and some big boots and there you go.